[WebSocketpp] websocketpp/0.8.2: variable used which is deprecated.

[qashoou]

Description

Websocketpp is a header-only recipe that does not call CMake by itself in its build method, but when being consumed gives the error of a variable which is deprecated.

/tmp/.conan2/p/webso7a47c7731495b/p/include/websocketpp/transport/asio/base.hpp:82:10: error: ‘template<long unsigned int _Len, long unsigned int _Align> struct std::aligned_storage’ is deprecated [-Werror=deprecated-declarations]
   82 |     lib::aligned_storage<size>::type m_storage;

Package and Environment Details

• Package Name/Version: websocketpp/0.8.2

• Operating System+version: Ubuntu 24.04.1 LTS

• Compiler+version: gcc version 13.2.0 (Ubuntu 13.2.0-23ubuntu4)

• Conan version: Conan version 2.9.2

• Python version: Python 3.12.3

Conan profile

[settings]
arch=x86_64
build_type=Release
compiler=gcc
compiler.cppstd=gnu17
compiler.version=13
os=Linux
compiler.cppstd=17
compiler.libcxx=libstdc++11

[options]
protobuf/*:debug_suffix=False

Steps to reproduce

build missing the package, and when cmake picks it up with -Werror=deprecated-declarations, the error comes up.

Logs

Click to expand log

/tmp/.conan2/p/webso7a47c7731495b/p/include/websocketpp/transport/asio/base.hpp:82:10: error: ‘template<long unsigned int _Len, long unsigned int _Align> struct std::aligned_storage’ is deprecated [-Werror=deprecated-declarations]
   82 |     lib::aligned_storage<size>::type m_storage;
      |          ^~~~~~~~~~~~~~~

[AbrilRBS]

Hi @qashoou thanks a lot for the report

This issue comes from upstream's usage of a deprecated feature in C++23.

Is there a chance that you're enabling Werror on your consumer side? Disabling those for this specific flag would be enough to work around the issue, as the websocketpp recipe itself is a header-only recipe and is not built by itself, but as part of your consumers.

If you need extra help, providing a full compilation log would help tremendously, thanks!